it works in the polls. centrist voters, swing voters, are looking for a candidate that is not representing the ideological extremes. it comes back to mitt romney as a flip-flopper. someone who is expedient when it comes to policy, whatever he needs to do to achieve a short-term political goal. that does create an opening. it hasn't been exploited by the obama campaign yet. this is what he said before. this is what he said now. which time was he telling the truth? >> we'll see tuesday night. >> in your opinion, who stands to benefit more from a town hall-style format? >> the president draws more energy off crowds. i think this will be a better arena for him, naturally. noneconomic domestic issues, social issues, that puts mitt romney in a tricky spot reaching towards the center. >> john avlon, we appreciate it so much. abc news will have live coverage of the second presidential debate, tuesday night, starting at 9:00 eastern, with diane sawyer and george stephanopoulos. >>> and tomorrow on "this week," you'l